<template>
  <div>
    父组件 --- {{ num }}
    <br>
    <Son v-model="num" />
  </div>
</template>

<script>
import Son from './Son.vue'
export default {
  components: {
    Son
  },
  data() {
    return {
      num: 1000
    }
  }
}
</script>

<style lang="scss" scoped>

</style>
